Question 406323 in Javascript Question posted in
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Iterate over indices of codepoints in JavaScript string

How can one iterate over the indices of codepoints and their values in a JavaScript string?

For example, [...codepointIndices("H🏁ello")] should output:

[[0, "H"], [1, "🏁"], [3, "e"], [4, "l"], [5, "l"], [6, "o"]]

One can iterate over codepoints in JavaScript with String.prototype[Symbol.iterator], but there does not appear to be an in-built way to include the indices of each codepoint.

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2

Answers


  1. Chosen as BEST ANSWER
    0

    We can accumulate the codepoint lengths:

    function* codepointIndices(s) {
    let i = 0;
    for (let c of s) {
        yield [i, c];
        i += c.length;
    }
}

  2. 0

    Use Objet.entries and the spread operator on your string:

    const res = Object.entries([..."H🏁ello"]);
console.log(res)
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